So it sounds like they’re comparing the “effects of a nap” by comparing the control group performance at t1 with the nap group performance at t1, rather than the difference in the magnitude of improvement between the groups from time t0 to t1?
Yeah, that is what Figure 4 (which you attached in your comment) shows, and what the effect sizes reported in the abstract refer to. There does seem to be a trend towards nap groups across the studies having a bit lower baseline cognitive performance:
Figure S6 directly compares the change in performance of the groups, though the effect sizes are harder to interpret in it.
Yeah, that is what Figure 4 (which you attached in your comment) shows, and what the effect sizes reported in the abstract refer to. There does seem to be a trend towards nap groups across the studies having a bit lower baseline cognitive performance:
Figure S6 directly compares the change in performance of the groups, though the effect sizes are harder to interpret in it.
Thanks for digging out the supplemental figures! Interesting...